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| Illustration 1 | g03425336 |
(1) Port - (grapple close) (2) Port - "CCW" (rotate counter clockwise) (3) Motor (4) Port -"CW" (rotate clockwise) (5) Port - (grapple open) (6) Pinion gear (7) Ring gear and bearing (8) Port - "G" (grapple close) (9) Port - "GO" (grapple open) (10) Port - "GO" (grapple open) (11) Port - "G" (grapple close) (12) Swivel | |
Rotator Motor and Manifold
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| Illustration 2 | g03425377 |
Cross section view of motor (2) Port (rotate counter clockwise) (4) Port (rotate clockwise) (13) Cavity (14) Rotor set (15) Output shaft (16) Link | |
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| Illustration 3 | g03425372 |
Side view of motor (2) Port (rotate counter clockwise) (4) Port (rotate clockwise) (6) Pinion gear | |
The gerotor motor is the component that rotates the work tool. Pressurized hydraulic oil is used to force the motor to turn. The motor can turn in a clockwise direction or in a counterclockwise direction allowing the work tool to rotate in either direction.
Pressurized hydraulic oil enters port (2) or port (4). The point of entry is determined by the function chosen by the operator. When oil enters port (2), the oil flows from the port into cavity (13). Cavity (13) is the area that is formed by rotor set (14). The pressurized hydraulic oil causes the rotor set to rotate. Return oil flows to port (4) from cavity (13) back to the hydraulic tank.
Rotor set (14) is splined to link (16). Link (16) is splined to output shaft (15). Pinion gear (6) is mounted on shaft (15). The gear meshes with ring gear and bearing (12) that is mounted between the upper housing and the lower housing. As pinion gear (6) turns, ring gear and bearing (12) turn in the opposite direction. This action causes the lower housing of the work tool to rotate in the direction that was selected by the operator.
When the opposite direction of rotation is selected, oil enters the motor at port (4). The oil flows into cavity (13) from the port. The point of entry in cavity (13) from port (4) causes the oil to flow in the opposite direction. Return oil flows into port (3) from cavity (13) back to the hydraulic tank. The change in direction causes the work tool to rotate in the opposite direction.
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| Illustration 4 | g03425384 |
(17) Control Manifold Group (18) Cross over relief valve | |
Control manifold (17) is mounted to the gerotor motor on top of the two ports shown in Illustration 3. Cross over relief valve (18) is used to relieve excess pressure in the motor circuit. Oil must flow through the control manifold before the oil can enter the motor.
Control manifold (17) is designed to relieve pressure in the section of the hydraulic system that operates gerotor motor. Two crossover relief valves make up the control manifold. The relief valves protect each side of the motor circuit from excessive pressure.
The pressure setting of the relief valve is 15900 kPa (2306 psi). When the control manifold for the rotation of the work tool is activated, oil is supplied to one side of the motor circuit in order to operate the motor. If the oil pressure exceeds the setting of the relief valve for that circuit, the relief valve will open. Oil is then able to flow to the other side of the motor circuit and back to the tank.
When one side of the relief valve opens, excess pressure is dumped to the opposite side of the motor circuit. This design prevents total hydraulic pressure loss during rotation. This feature is a safety measure that improves the efficiency of the work tool.
Swivel
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| Illustration 5 | g03425427 |
Swivel (1) Port - "B" (grapple close) (5) Port - "A" (grapple open) (8) Port - "G" (grapple close) (10) Port - "GO" (grapple open) (11) Port - "G" (grapple close) (19) Rotor (20) Stator (21) Manifold | |
The swivel is mounted to the center of the upper housing. The transfer of hydraulic oil from the input lines in the upper housing to the hydraulic cylinders in the lower housing is accomplished through this component. The swivel allows the work tool to rotate 360 degrees preventing damage to the cylinder lines. Because rotor (19) is not fixed in place on stator (20), the rotor is free to rotate on the shaft of the stator allowing the upper housing to remain stationary while the lower housing rotates.
Manifold (21) divides port (1) and port (5) and is bolted to stator (20).
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| Illustration 6 | g03425469 |
Internal view of the swivel (open function) (1) Port - "B" (grapple close) (5) Port - "A" (grapple open) (8) Port - "G" (grapple close) (11) Port - "G" (grapple close) (19) Rotor (20) Stator (21) Manifold | |
Oil can enter the swivel at port (1) or port (5). The function that was selected by the operator determines the point of entry of the oil.
When oil enters port (5), the oil flows through the passage in stator (20) and manifold (21), and out both ports marked "GO" to the cylinders. Return oil will then flow back into ports marked "G" from the cylinders. The oil flows through the passage in manifold (21) and stator (20), and exits port (1) to the hydraulic tank.
When oil enters port (1), the oil flows through the passage in stator (20) and manifold (21), and out both ports marked "G" to the cylinders. Return oil will then flow back into ports marked "GO" from the cylinders. The oil flows through the passage in manifold (21) and stator (20), and exits port (5) to the hydraulic tank.
Because rotor (19) is bolted to the upper housing, the rotor remains stationary. Stator (20) and manifold (21) rotate with the lower housing.